1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3   * This file configures the internal USB PHY in OMAP4430. Used
4   * with TWL6030 transceiver and MUSB on OMAP4430.
5   *
6   * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com
7   * Author: Hema HK <hemahk@ti.com>
8   */
9 
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 
12 #include <linux/types.h>
13 #include <linux/delay.h>
14 #include <linux/clk.h>
15 #include <linux/io.h>
16 #include <linux/err.h>
17 #include <linux/usb.h>
18 #include <linux/usb/musb.h>
19 
20 #include "soc.h"
21 #include "control.h"
22 #include "usb.h"
23 
24 #define CONTROL_DEV_CONF		0x300
25 #define PHY_PD				0x1
26 
27 /**
28  * omap4430_phy_power_down: disable MUSB PHY during early init
29  *
30  * OMAP4 MUSB PHY module is enabled by default on reset, but this will
31  * prevent core retention if not disabled by SW. USB driver will
32  * later on enable this, once and if the driver needs it.
33  */
34 static int __init omap4430_phy_power_down(void)
35 {
36 	void __iomem *ctrl_base;
37 
38 	if (!cpu_is_omap44xx())
39 		return 0;
40 
41 	ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
42 	if (!ctrl_base) {
43 		pr_err("control module ioremap failed\n");
44 		return -ENOMEM;
45 	}
46 
47 	/* Power down the phy */
48 	writel_relaxed(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
49 
50 	iounmap(ctrl_base);
51 
52 	return 0;
53 }
54 omap_early_initcall(omap4430_phy_power_down);
55 
56 void am35x_musb_reset(void)
57 {
58 	u32	regval;
59 
60 	/* Reset the musb interface */
61 	regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
62 
63 	regval |= AM35XX_USBOTGSS_SW_RST;
64 	omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
65 
66 	regval &= ~AM35XX_USBOTGSS_SW_RST;
67 	omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
68 
69 	regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
70 }
71 
72 void am35x_musb_phy_power(u8 on)
73 {
74 	unsigned long timeout = jiffies + msecs_to_jiffies(100);
75 	u32 devconf2;
76 
77 	if (on) {
78 		/*
79 		 * Start the on-chip PHY and its PLL.
80 		 */
81 		devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
82 
83 		devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN);
84 		devconf2 |= CONF2_PHY_PLLON;
85 
86 		omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
87 
88 		pr_info("Waiting for PHY clock good...\n");
89 		while (!(omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2)
90 				& CONF2_PHYCLKGD)) {
91 			cpu_relax();
92 
93 			if (time_after(jiffies, timeout)) {
94 				pr_err("musb PHY clock good timed out\n");
95 				break;
96 			}
97 		}
98 	} else {
99 		/*
100 		 * Power down the on-chip PHY.
101 		 */
102 		devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
103 
104 		devconf2 &= ~CONF2_PHY_PLLON;
105 		devconf2 |=  CONF2_PHYPWRDN | CONF2_OTGPWRDN;
106 		omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
107 	}
108 }
109 
110 void am35x_musb_clear_irq(void)
111 {
112 	u32 regval;
113 
114 	regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
115 	regval |= AM35XX_USBOTGSS_INT_CLR;
116 	omap_ctrl_writel(regval, AM35XX_CONTROL_LVL_INTR_CLEAR);
117 	regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
118 }
119 
120 void am35x_set_mode(u8 musb_mode)
121 {
122 	u32 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
123 
124 	devconf2 &= ~CONF2_OTGMODE;
125 	switch (musb_mode) {
126 	case MUSB_HOST:		/* Force VBUS valid, ID = 0 */
127 		devconf2 |= CONF2_FORCE_HOST;
128 		break;
129 	case MUSB_PERIPHERAL:	/* Force VBUS valid, ID = 1 */
130 		devconf2 |= CONF2_FORCE_DEVICE;
131 		break;
132 	case MUSB_OTG:		/* Don't override the VBUS/ID comparators */
133 		devconf2 |= CONF2_NO_OVERRIDE;
134 		break;
135 	default:
136 		pr_info("Unsupported mode %u\n", musb_mode);
137 	}
138 
139 	omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
140 }
141